Allow a wider range of characters for filenames in migrid

[Bjarke42]

Please allow a wider range of characters for filenames in migrid.

We would like to be able to support most if not all characters for file names that are also allowed in windows. There are ofcause base character limits even in POSIX, but our focus is mostly on supporting characters >127, ie. UTF-8 packed characters, as well as more special characters <127 that are allowed on windows platform.

We would suggest this be implemented in ssh with the widest range of supported characters, since the idea is that would break the least amount of security restrictions for web and webdav.

This would make it possible to make alot more seamless transition with copying data directly from windows drive onto lustre data storage.